Colonoscopy usually done under iv sedation in most of Indian setups for adults but if it being done for children or patients who are not able to follow command then it will be done under general anaesthesia,
If it's done under iv sedation , sometimes u may feel abdominal fullness.
Next Steps
consult a gastroentrologist and discuss steps of procedure before.
u need to take a laxative to clean up your bowel for better visualization.
for this u will pass stools multiple time , so u will need iv fluids and your
electrolytes need to be monitored.( sodium & potassium)
U will need pre procedure antibiotics depend on the reason for colonoscopy.
so your doctor will ask to admit one day prior and for anaesthesia evaluation.
Health Tips
post procedure mostly u won't feel anything but if u are feeling pain it should be evaluated bcoz there might be chances of bleeding and perforation of bowel , which is hole in your intestine. which is an emergency . But usually rare in hands of a experienced surgeon.